%0 Journal Article %A Joseph Valentine %T Banach-Euclidean four-point properties %J Fundamenta Mathematicae %D 1980 %P 227-230 %V 106 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/fm-106-3-227-230/ %R 10.4064/fm-106-3-227-230 %G en %F 10_4064_fm_106_3_227_230